|From Cattlenetwork.com: Investors burned by the commodity crash this year now have another way to lose money. Some markets that major commodity indexes track have tilted into an extreme version of a pattern known as "contango," in which commodities for delivery within weeks cost less than those for delivery later on.
Index-tracking funds often "roll" nearby contracts from one month to the next as they expire. In a contango market, that means selling low and buying high on a monthly basis. .... Full Article: Source